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A056670
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Largest prime-factor of which the exponent exceeds 1 among prime factors of central binomial coefficient, C(n,[n/2]); largest non-unitary prime factor of A001405(n); or the maximal prime divisor of the largest square divisor(A056057(n)) of C(n,[n/2]).
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0
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1, 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 2, 2, 2, 3, 3, 1, 2, 1, 2, 2, 2, 1, 2, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 7, 7, 7, 7, 7, 7, 3, 3, 1, 2, 2, 2, 5, 5, 7, 7, 7, 7, 7, 7, 3, 3, 5, 5, 5, 5, 3, 3, 7, 7, 7, 7, 7, 7, 5, 5, 3, 3, 3, 3, 3, 3, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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EXAMPLE
| n=28,C(28,14)=2.2.2.3.3.7.7.13,29.31.41.43.47, so a(28)=7 n=342,C(342,171)=32*F, where F is squarefree, so a(341)=2.
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CROSSREFS
| A001405, A056175, A056057.
Sequence in context: A129453 A129455 A067924 * A170925 A030189 A114162
Adjacent sequences: A056667 A056668 A056669 * A056671 A056672 A056673
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Aug 10 2000
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